My good friend and fellow twitterer, Chris Harrison has written a very interesting and engaging blog about SMIDSY incidents.
You might enjoy reading what he has to say on the subject as well.
Smidsy in the article is stated as the “most common cause” of m/c accidents. I thought it was one vehicle bike accidents I.e overcooking a corner/too fast etc! I’ve got no reference or source for this but it sounds more true.